ガルバスラ / CGI

　Perl式に@配列名 = で書いてますが、$配列名 = arrayにしてやればPHPにも転用できます。

　VGA(Video Graphics Array) 16色指定ですね。
　RGB カラーネーム 140色…色はRed Green Blueの三色でできているのは知っているかと思います。【光の三原色】、でしたっけ？
　掲示板の色選択などに使える色一覧を書いておきます。
　コピー・ペーストしてお使いください。

　Web Safe Color 216色については8Bit=256(2^8)色→Win, Macで異なる40表示色引いて216(R:6 x G:6 x B:6)色にしたもの。
　0x[16進数表記](10進数表記)→00(00), 33(51), 99(153), cc(204), ff(255)指定の色

　ちなみに、プリンタインク等で使われる【色の三原色】はCMYでCyan Yellow Magentaの3色組み合わせ。
　色彩論やら三原色・等和色やらそういったのは自分で調べるがよろし。

@c_vga = (
'00FFFF','000000','0000FF','FF00FF','808080','008000','00FF00','800000',
'000080','808000','800080','FF0000','C0C0C0','008080','FFFFFF','FFFF00'
);

@c_namev = (
'Aqua', 'Black', 'Blue', 'Fuchsia', 'Gray', 'Green', 'Lime', 'Maroon', 'Navy', 'Olive', 'Purple', 'Red', 'Silver', 'Teal', 'White', 'Yellow'
);

@c_vga = (
'000000','000080','0000FF','008000','008080','00FF00','00FFFF','800000',
'800080','808000','808080','C0C0C0','FF0000','FF00FF','FFFF00','FFFFFF'
);

@c_namev = (
'Black', 'Navy', 'Blue', 'Green', 'Teal', 'Lime', 'Aqua', 'Maroon', 'Purple', 'Olive', 'Gray', 'Silver', 'Red', 'Fuchsia', 'Yellow', 'White'
);

@c_rgb = (
'F0F8FF','FAEBD7','00FFFF','7FFFDF','F0FFFF','F5F5DC','FFE4C4','000000','FFEBCD','0000FF', '8A2BE2','A52A2A','DEB887','5F9EA0','7FFF00','D2691E','FF7550','6495ED','FFF8DC','DC143C', '00FFFF','00008B','008B8B','B8860B','A9A9A9','006400','BDB76B','8B008B','556B2F','FF8C00', '9932CC','8B0000','E9967A','8FBC8F','483D8B','2F4F4F','00CED1','9400D3','FF1493','00BFFF', '696969','1E90FF','B22222','FFFAF0','228B22','FF00FF','DCDCDC','F8F8FF','FFD700','DAA520', '808080','008000','ADFF2F','F0FFF0','FF69B4','CD5C5C','4B0082','FFFFF0','F0E68C','E6E6FA', 'FFF0F5','7CFC00','FFFACD','ADD8E6','F08080','E0FFFF','FAFAD2','90EE90','D3D3D3','FFB6C1', 'FFA07A','20B2AA','87CEFA','778899','B0C4DE','FFFFE0','00FF00','32CD32','FAF0E6','FF00FF', '800000','66CDAA','0000CD','BA55D3','9370DB','3CB371','7B68EE','00FA9A','48D1CC','C71585', '191970','F5FFFA','FFE4E1','FFE4B5','FFDEAD','000080','FDF5E6','808000','6B8E23','FFA500', 'FF4500','DA70D6','EEE8AA','98FB98','AFEEEE','DB7093','FFEFD5','FFDAB9','CD853F','FFC0CB', 'DDA0DD','B0E0E6','800080','FF0000','BC8F8F','4169E1','8B4513','FA8072','F4A460','2E8B57', 'FFF5EE','A0522D','C0C0C0','87CEEB','6A5ACD','708090','FFFAFA','00FF7F','4682B4','D2B48C', '008080','D8BFD8','FF6347','40E0D0','EE82EE','F5DEB3','FFFFFF','F5F5F5','FFFF00','9ACD32' );

@c_namer = (
'Aliceblue', 'Antiquewhite', 'Aqua', 'Aquamarine', 'Azure', 'Beige', 'Bisque', 'Black', 'Blanchedalmond', 'Blue', 'Blueviolet', 'Brown', 'Burlywood', 'Cadetblue', 'Chartreuse', 'Chocolate', 'Coral', 'Cornflowerblue', 'Cornsilk', 'Crimson', 'Cyan', 'Darkblue', 'Darkcyan', 'Darkgoldenrod', 'Darkgray', 'Darkgreen', 'Darkkhaki', 'Darkmagenta', 'Darkolivegreen', 'Darkorange', 'Darkorchid', 'Darkred', 'Darksalmon', 'Darkseagreen', 'Darkslateblue', 'Darkslategray', 'Darkturquoise', 'Darkviolet', 'Deeppink', 'Deepskyblue', 'Dimgray', 'Dodgerblue', 'Firebrick', 'Floralwhite', 'Forestgreen', 'Fuchsia', 'Gainsboro', 'Ghostwhite', 'Gold', 'Goldenrod', 'Gray', 'Green', 'Greenyellow', 'Honeydew', 'Hotpink', 'Indianred', 'Indigo', 'Ivory', 'Khaki', 'Lavender', 'Lavenderblush', 'Lawngreen', 'Lemonchiffon', 'Lightblue', 'Lightcoral', 'Lightcyan', 'Lightgoldenrodyellow', 'Lightgreen', 'Lightgrey', 'Lightpink', 'Lightsalmon', 'Lightseagreen', 'Lightskyblue', 'Lightslategray', 'Lightsteelblue', 'Lightyellow', 'Lime', 'Limegreen', 'Linen', 'Magenta', 'Maroon', 'Mediumaquamarine', 'Mediumblue', 'Mediumorchid', 'Mediumpurple', 'Mediumseagreen', 'Mediumslateblue', 'Mediumspringgreen', 'Mediumturquoise', 'Mediumvioletred', 'Midnightblue', 'Mintcream', 'Mistyrose', 'Moccasin', 'Navajowhite', 'Navy', 'Oldlace', 'Olive', 'Olivedrab', 'Orange', 'Orangered', 'Orchid', 'Palegoldenrod', 'Palegreen', 'Paleturquoise', 'Palevioletred', 'Papayawhip', 'Peachpuff', 'Peru', 'Pink', 'Plum', 'Powderblue', 'Purple', 'Red', 'Rosybrown', 'Royalblue', 'Saddlebrown', 'Salmon', 'Sandybrown', 'Seagreen', 'Seashell', 'Sienna', 'Silver', 'Skyblue', 'Slateblue', 'Slategray', 'Snow', 'Springgreen', 'Steelblue', 'Tan', 'Teal', 'Thistle', 'Tomato', 'Turquoise', 'Violet', 'Wheat', 'White', 'Whitesmoke', 'Yellow', 'Yellowgreen' );

　白系・黒系背景サイトによって色を削除していくと良い感じに使えるかと思います。

@c_rgb = (
'000000','000080','00008B','0000CD','0000FF','006400','008000','008080','008B8B','00BFFF', '00CED1','00FA9A','00FF00','00FF7F','00FF80','00FFFF','191970','1E90FF','20B2AA','228B22', '2E8B57','2F4F4F','32CD32','3CB371','40E0D0','4169E1','4682B4','483D8B','48D1CC','4B0082', '556B2F','5F9EA0','6495ED','66CDAA','696969','6A5ACD','6B8E23','708090','778899','7B68EE', '7CFC00','7FFF00','7FFFD4','800000','800080','808000','808080','87CEEB','87CEFA','8A2BE2', '8B0000','8B008B','8B4513','8FBC8F','90EE90','9370DB','9400D3','98FB98','9983CC','9ACD32', 'A0522D','A52A2A','A9A9A9','ADD8E6','ADFF2F','AFEEEE','B0C4DE','B0E0E6','B22222','B8860B', 'BA55D3','BC8F8F','BDB76B','C0C0C0','C71585','CD5C5C','CD853F','D2691E','D2B48C','D3D3D3', 'D8BFD8','DA70D6','DAA520','DB7093','DC143C','DCDCDC','DDA0DD','DEB887','E0FFFF','E6E6FA', 'E9967A','EE82EE','EEE8AA','F08080','F0E68C','F0F8FF','F0FFF0','F0FFFF','F4A460','F5DEB3', 'F5F5DC','F5F5F5','F5FFFA','F8F8FF','FA8072','FAEBD7','FAF0E6','FAFAD2','FDF5E6','FF0000', 'FF0080','FF00FF','FF1493','FF4500','FF6347','FF69B4','FF7F50','FF8C00','FFA07A','FFA500', 'FFB6C1','FFC0CB','FFD700','FFDAB9','FFDEAD','FFE4B5','FFE4C4','FFE4E1','FFEBCD','FFEFD5', 'FFF0F5','FFF5EE','FFF8DC','FFFACD','FFFAF0','FFFAFA','FFFF00','FFFFE0','FFFFF0','FFFFFF' );

@c_namer = (
'Black', 'Navy', 'Darkblue', 'Mediumblue', 'Blue', 'Darkgreen', 'Green', 'Teal', 'Darkcyan', 'Deepskyblue', 'Darkturquoise', 'Mediumspringgreen', 'Lime', 'Springgreen', 'Aqua', 'Cyan', 'Midnightblue', 'Dodgerblue', 'Lightseagreen', 'Forestgreen', 'Seagreen', 'Darkslategray', 'Limegreen', 'Mediumseagreen', 'Turquoise', 'Royalblue', 'Steelblue', 'Darkslateblue', 'Mediumturquoise', 'Indigo', 'Darkolivegreen', 'Cadetblue', 'Cornflowerblue', 'Mediumaquamarine', 'Dimgray', 'Slateblue', 'Olivedrab', 'Slategray', 'Lightslategray', 'Mediumslateblue', 'Lawngreen', 'Chartreuse', 'Aquamarine', 'Maroon', 'Purple', 'Olive', 'Gray', 'Skyblue', 'Lightskyblue', 'Blueviolet', 'Darkred', 'Darkmagenta', 'Saddlebrown', 'Darkseagreen', 'Lightgreen', 'Mediumpurple', 'Darkviolet', 'Palegreen', 'Darkorchid', 'Yellowgreen', 'Sienna', 'Brown', 'Darkgray', 'Lightblue', 'Greenyellow', 'Paleturquoise', 'Lightsteelblue', 'Powderblue', 'Firebrick', 'Darkgoldenrod', 'Mediumorchid', 'Rosybrown', 'Darkkhaki', 'Silver', 'Mediumvioletred', 'Indianred', 'Peru', 'Chocolate', 'Tan', 'Lightgrey', 'Thistle', 'Orchid', 'Goldenrod', 'Palevioletred', 'Crimson', 'Gainsboro', 'Plum', 'Burlywood', 'Lightcyan', 'Lavender', 'Darksalmon', 'Violet', 'Palegoldenrod', 'Lightcoral', 'Khaki', 'Aliceblue', 'Honeydew', 'Azure', 'Sandybrown', 'Wheat', 'Beige', 'Whitesmoke', 'Mintcream', 'Ghostwhite', 'Salmon', 'Antiquewhite', 'Linen', 'Lightgoldenrodyellow', 'Oldlace', 'Red', 'Magenta', 'Fuchsia', 'Deeppink', 'Orangered', 'Tomato', 'Hotpink', 'Coral', 'Darkorange', 'Lightsalmon', 'Orange', 'Lightpink', 'Pink', 'Gold', 'Peachpuff', 'Navajowhite', 'Moccasin', 'Disque', 'Mistyrose', 'Blanchedalmond', 'Papayawhip', 'Lavenderblush', 'Seashell', 'Cornsilk', 'Lemonchiffon', 'Floralwhite', 'Snow', 'Yellow', 'Lightyellow', 'Ivory', 'White' );